<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>font-size</title>
</head>
<body>
    <div style="font-size: 1px">font-size: 1px</div>
    <div style="font-size: 2px">font-size: 2px</div>
    <div style="font-size: 3px">font-size: 3px</div>
    <div style="font-size: 4px">font-size: 4px</div>
    <div style="font-size: 5px">font-size: 5px</div>
    <div style="font-size: 6px">font-size: 6px</div>
    <div style="font-size: 7px">font-size: 7px</div>
    <div style="font-size: 8px">font-size: 8px</div>
    <div style="font-size: 9px">font-size: 9px</div>
    <div style="font-size: 10px">font-size: 10px</div>
    <div style="font-size: 11px">font-size: 11px</div>
    <div style="font-size: 12px">font-size: 12px</div>
    <div style="font-size: 13px">font-size: 13px</div>
    <div style="font-size: 14px">font-size: 14px</div>
    <div style="font-size: 15px">font-size: 15px</div>
    <div style="font-size: 16px">font-size: 16px</div>
    <div style="font-size: 17px">font-size: 17px</div>
    <div style="font-size: 18px">font-size: 18px</div>
    <div style="font-size: 19px">font-size: 19px</div>
    <div style="font-size: 20px">font-size: 20px</div>
</body>
</html>